[Xtensa] Define register type for CC

Implement getRegisterTypeForCallingConv() method in XtensaTargetLowering

Author: andreisfr

llvm/lib/Target/Xtensa/XtensaISelLowering.cpp

@@ -340,6 +340,16 @@ XtensaTargetLowering::XtensaTargetLowering(const TargetMachine &tm,
   computeRegisterProperties(STI.getRegisterInfo());
 }
 
+/// Return the register type for a given MVT
+MVT XtensaTargetLowering::getRegisterTypeForCallingConv(LLVMContext &Context,
+                                                      CallingConv::ID CC,
+                                                      EVT VT) const {
+  if (VT.isFloatingPoint())
+    return MVT::i32;
+
+  return TargetLowering::getRegisterTypeForCallingConv(Context, CC, VT);
+}
+
 /// If a physical register, this returns the register that receives the
 /// exception address on entry to an EH pad.
 Register XtensaTargetLowering::getExceptionPointerRegister(

llvm/lib/Target/Xtensa/XtensaISelLowering.h

@@ -102,6 +102,10 @@ class XtensaTargetLowering : public TargetLowering {
     return LHSTy.getSizeInBits() <= 32 ? MVT::i32 : MVT::i64;
   }
 
+  /// Return the register type for a given MVT
+  MVT getRegisterTypeForCallingConv(LLVMContext &Context, CallingConv::ID CC,
+                                    EVT VT) const override;
+
   EVT getSetCCResultType(const DataLayout &, LLVMContext &,
                          EVT VT) const override {
     if (!VT.isVector())